Filter for gaseous substances



May 10, 1952. w. BOKENKROGER FILTER FOR GASEOUS IUBSTANCES Filed May 14, 1928 \\\\U,f V W. w W W .k A W A & MK A k A A k A A A A A V V w W AkA A A V V N V N V1 w A A @h 1 7 9 M m A H A HH /aOu U j nul a am A/ H I- w, [H a H H W 1 6 i F L E uuuuuu 3 INVENTOR 6 I ATTORNEY z lz "flanged couplings Patented May 10, 1932 emme. sfr Ares PATENT I FILTER FOR GASEOIIS SUBSTANCES Application filed May '14,

My invention relates "to filters for gaseous substances, particularly air, in connection with the innumerable instancesof industrial application such apparatus has found durl ing these last 7 years. The obj ects of my 1n- '-=ven'tion are to providea gas filter WhlGh, first, is easily inserted in, 1 or attached to ithe --end-=df, a conduit; second, .does :not impair the fiow of the' gas; third, has 'me'ans ffor -10 'bringing all parts of the gas-into cleansing contact with the filter fourth, exposes 'the whole filter to *the flow of the gas; fifth, consists of a fixed arrangement which is not subject to any change in respect to its" rel sistance to the how of the gas; six'th, has means for 'the preservation of its moisture; seventh, has means for regenerating the absorptive 'quality of the'exposed 'xfilbering 7 various "filters 1s thus provided and the gas 'parts; eighth, can readily betaken; apart for cleaning; ninth, can at any time I :to its original efliciency by the replacement tof'simple,inexpensive'parts,; tenth, has means for fool-proof alignment ioff the replacement parts. i

4 lattainthese objectsrby the'type-ofa device' illustrated in the accompanying drawings in which Figure 1 1s device.

, Figure elevation,

a sectional "top view, of my 2*is "the corresponding sectional *Figure3 is artopview ofthe'filtering part,

.sholing a slight "variation from the :one {of Figures 1 "and 2.

fFi'gnre 4 hows the-side elevationofysame. "Figure 15 is the correspondingfront elevation of the part.

,Similar'numerals' refer :to similar parts throughout the various views. 7 I

The inlet and outlet 6 of my device may be provisions to connect, by any Of-the-meth eds commonly known,'to -agas or air conduit.

' 'On the air intakef an internal combustion I for instance, provide -in these which gaskets engine I may,

are securedbetween the tubes connecting 1 to a the carburetor or "vaporize-r. One lof ithese -openings 'forms -partof the 3 container 7, f the ether Lone forms part of the cover 8 :o'f my device. "These parts may be assembled Lto be restored 192s. 'fSeriaP'Ko; 227,432. I p

each ioth'er eby I :pushv fit, .or they may. :have a threaded or flangedifitting, or a: spiral 'lock, or any .ofLthe many means .:of connection known .to this I art.

"llhezfilter members-*9 are unade of ianfabsorbent material suchas felt,- soft.cardiboard, 'ipumice or any .other porous material .:suited for binding dust :or other small particles iof substances, iwhen kept moist. These-:filters 9 are provided with :penforations 10 land .on -so theirJcircumfereneessthey showathe rims 111 which :spacthem against :each other.

As evident from the drawings, adjacent *filters are.alternatingly shifted inrespect to each other :for: 90, so ithat the lholesin reach fli filter .overlie the solid spaces :between :holes JlZlPOll :the :adjacentfilters. A staggered arrangement :of ethe passages throughout the isv-whirledv about Iand;a1l zOf its .parts iare m n broughtinto contact with the ifilters on pass ing rthrough my :device.

1 Figure '3 showsvaslight;change. inithe eonstructiongof imy sfilters; :whereas :the iperfo rar opposing-sides, whereas the 90?:space :12Hbe- @tween Ethese :sectors all? does not ahaveuany rims. It is also-noticedithatcorresponding lrimisectors *1'1 i-are provided oniboth ::tl1e itopzand bottomtofitheifilter members, @If lwe't'urn'therside vievwof Figure 1L Offithisifilter 'ithrough 90, itthas the appearance ;of "Fig- :-:ure 5; and :in'aztopview corresponding-lo :Figure' 5 the perforations 10* would .corresp 0nd :toxthe dottedl-perfonations-of PFigure Itis evidentithatiwhentheparts:of igures 14; and :5 c are"; brought together,- rims 1'1 inter- Llock, so that the: center parts are: respectively spaced apart in substantially the same away 1 as i the; center parts of the i-filters in gnre 2. il herefo-rera series ofi filtersdike Eigluresfilwill Jbe readily -assembled to form a filter: ar-

a 1 rangement withathe: holes 10*: in staggemdcrelation to eachiotherxlinithew-manner ,ofiEighereas .it is necessary to provideimeans "tions :10 :in the'ifilter 'mer'nberl are (Lorresubstances, provided, first, the filters are shaped to fit into said conduit; second, the

conduit is of such siiethat the restrictionof the passage due to the filter does not cause undue resistance for the flow ofth'e' gaseous substances; third, there are some means in said conduit to support thefirst and last filter in coaxial direction. Apparently the last re quirement must bespecially provided for, because it is not ordinarily found inaconduit. But I easily can provide in a conduit a slight shoulder against which reststhe first ofmy filters, and a recess maybe provided next to the last one of my filters into which a tensile expansion ring may be snapped after the filters have been arranged in position. This arrangement seems to be the most simple means to attain the above purpose but, of

course, there are known to the. mechanical arts many other Ways to reach the same end. Whereas inthe drawings I attain the object of opening the filters at a suitable distance, by rimsprotruding from the plane of I said filters around their circumference, there 1 are many other waysb which I space the filters at; the desired istances from each other. Suitable protrusions in the shape of lugs orribs maybe provided anywhere on the face of the filters and take the place of the protruding rims, or, without making the filters thicker. at anypoint of its plane, I

may shape said filter members in such a way that 'each provides for the proper spacing against theadj acent ones. I may,:for instance carry through the latter way of constructing vmyufilters .by 'corrugating: them,the same way as sheet'metal may be corrugated,the,

overall thickness of the corrugated filter being the same asthe distance between the corresponding points of adjacent filters in the methodofexecution illustrated in the drawings. In that case, I shall resort toa transverse arrangement of the corrugationsv of adjoining filters, and shall preferably have means to retain adjacent filters with the cor-- to limit myself to the shape of round holes rugations at right angles to each other.

Itis further understood that I do not want for the perforations inthe filtersybut such perforations may have the shape of squares,

v.slots, sectorial or segmental openings, pro- 53560 'viding the essential part of my invention,

- i. e.-,the feature of having the openings in "each filter face solid parts of the adjacent filters, is maintained throughout. 7

I make my filters of an essentially homogeneously porous structure throughout. The

porous material is molded or otherwise suit= ably fashioned to the desired shape, or materials of a fibrous or hairy structure may be pressed into that shape, a suitable binder being used if necessary. The finished filters are self-supporting and will normally rctain their shapeindefinitel The material comprising the filter mem er is such that the liquid used does not cause dissolution or a distortion of the shape of the filter.

I choose thematerial and thickness of the filters so as to provide sufiicient space in the porous structure to retain an adequate amount of the liquid which I coat over said filter members'and' impregnate therein, and utilize to bind the impurities in the gas as it, flows over the face of said filter. 7 Of course,

' the passage of the gas will cause evaporation of: some of thatcoated and impregnated liq uid, and the required moisture of the surface of the filter is restored by diffusion of the liquid in the pores of said filter, its. circulation in the body of the filter members, and its flow to the filter surface. Likewise the diffusive qualities ofthe liquid used must beg, such as to allow the material removed from the passing gas by adhesion to the moist surface of the filters or, tothe moisture on said surface, to be carried to the. inside of said filter by the diffusion. The liquid which I; have found most suitable for the purpose of carrying throughmy invention are oilsof low Vapor tension, which are so uniform in ghat respect as practically can be provided with a dust gathering liquid that they will, for a long period, without reimpregnation,

present a moist surface to the passing dust,

the filter members will effectually lter the passing gases, but I provide also a type of filter member, which, as the result of this circulation, will automatically so purify the dust laden liquid with which it is coated, that, in the process of circuation through the body: of these filter members, this liquid itself is repurified, to be again automatically diffused to the surface of these filter members, in a substantially originally pure condition, for reuse.

Iclaim:

1. A device of the character described comprising a tubular container, said container being contractedat one end, detachable retaining means on the other end of saidcontainer, a plurality. of perforated porous plates saturated andcoated with a fluid dust binding substance stacked in said container between said contracted end and said retaining means, andirims-forminga unit with each ofsaid the provision of filter members of this porouscharacter, which'are so impregnated plates projecting therefrom, positioning adjacent plates in predetermined spaced relation to each other.

2. A device of the character described comprising a tubular container, said container being contracted at one end, detachable retaining means on the other end of said container, a plurality'of porous plates stacked in said container between said contracted end and said retaining means having a series of perforations formed in the bodies ofsaid plates, and complementary sectorial rims forming a unit with each of said plates, on opposite sides thereof, locating said plates in spaced relation to each other so that the perforations of each of said plates face solid parts of said bodies of the adjacent plates.

WILLIAM BOKENKROGER. 

